html, body{
    margin: 0,auto;
    text-align: center;
}
#title{
    margin-bottom: 10px;
}
#main{
    margin: 0 auto;
    width: 550px;
    height: 250px;
}
#chart{
    margin: 0 auto;
    width: 700px;
    height: 320px;
}